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This paper deals with the subject of hyperconcentrated fluids. The goal is to develop a rheological characterization of solidliquid mixtures (waterkaolinitic clay) with different volume concenRBRH – Revista Brasileira de Recursos Hídricos Volume 8 n.4 Out/Dez 2003, 95-105 105 trations (Cv) for which the rheologic properties such as the apparent viscosity, yield stress value and curve of shear stress versus shear rate are determined, using a high precision rheometer (shear stress and controlled shear rate). Under controlled conditions, the influence of the temperature, pH and volume concentration (Cv) on the rheologic curve of those mixtures was verified, besides possible thixotropic phenomena and mode of preparation. The rheologic model fitted was HerschelBulkley: ( )n c k γ + τ = τ & , in which: τ is the shear stress; •c is the yield stress value; k is a consistence term (apparent viscosity); n is the flow index; and dy du = γ& is the shear rate. Finally, laws of evolution of the various rheologic parameters as a function of volume concentration were obtained from a global quantitative analysis. The results obtained in that first series of experimental data agree with those presented in literature.

Evolução de Frentes de Lama em Canais ? Parte I: Uma Proposta Reológica de Herschel-Bulkley a Partir de uma Base Experimentalista Física